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x86, relocs: Add manual debug mode

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Improve the debuggability of relocations output. When trying to compare
the output between different linkers, it's handy to be able to see the
section names in output.

Signed-off-by: Michael Davidson <md@google.com>
Link: http://lkml.kernel.org/r/20140121203223.GA12649@www.outflux.net
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Michael Davidson 2014-01-21 12:32:23 -08:00 committed by H. Peter Anvin
parent 6f34152f54
commit 214a88768d
3 changed files with 45 additions and 8 deletions
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30
arch/x86/tools/relocs.c
View file

@ -1015,6 +1015,29 @@ static void emit_relocs(int as_text, int use_real_mode)
}
}
/*
* As an aid to debugging problems with different linkers
* print summary information about the relocs.
* Since different linkers tend to emit the sections in
* different orders we use the section names in the output.
*/
static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
const char *symname)
{
printf("%s\t%s\t%s\t%s\n",
sec_name(sec->shdr.sh_info),
rel_type(ELF_R_TYPE(rel->r_info)),
symname,
sec_name(sym->st_shndx));
return 0;
}
static void print_reloc_info(void)
{
printf("reloc section\treloc type\tsymbol\tsymbol section\n");
walk_relocs(do_reloc_info);
}
#if ELF_BITS == 64
# define process process_64
#else
@ -1022,7 +1045,8 @@ static void emit_relocs(int as_text, int use_real_mode)
#endif
void process(FILE *fp, int use_real_mode, int as_text,
int show_absolute_syms, int show_absolute_relocs)
int show_absolute_syms, int show_absolute_relocs,
int show_reloc_info)
{
regex_init(use_real_mode);
read_ehdr(fp);
@ -1040,5 +1064,9 @@ void process(FILE *fp, int use_real_mode, int as_text,
print_absolute_relocs();
return;
}
if (show_reloc_info) {
print_reloc_info();
return;
}
emit_relocs(as_text, use_real_mode);
}

7
arch/x86/tools/relocs.h
View file

@ -29,8 +29,9 @@ enum symtype {
};
void process_32(FILE *fp, int use_real_mode, int as_text,
int show_absolute_syms, int show_absolute_relocs);
int show_absolute_syms, int show_absolute_relocs,
int show_reloc_info);
void process_64(FILE *fp, int use_real_mode, int as_text,
int show_absolute_syms, int show_absolute_relocs);
int show_absolute_syms, int show_absolute_relocs,
int show_reloc_info);
#endif /* RELOCS_H */

16
arch/x86/tools/relocs_common.c
View file

@ -11,12 +11,13 @@ void die(char *fmt, ...)
static void usage(void)
{
die("relocs [--abs-syms|--abs-relocs|--text|--realmode] vmlinux\n");
die("relocs [--abs-syms|--abs-relocs|--reloc-info|--text|--realmode]" \
" vmlinux\n");
}
int main(int argc, char **argv)
{
int show_absolute_syms, show_absolute_relocs;
int show_absolute_syms, show_absolute_relocs, show_reloc_info;
int as_text, use_real_mode;
const char *fname;
FILE *fp;
@ -25,6 +26,7 @@ int main(int argc, char **argv)
show_absolute_syms = 0;
show_absolute_relocs = 0;
show_reloc_info = 0;
as_text = 0;
use_real_mode = 0;
fname = NULL;
@ -39,6 +41,10 @@ int main(int argc, char **argv)
show_absolute_relocs = 1;
continue;
}
if (strcmp(arg, "--reloc-info") == 0) {
show_reloc_info = 1;
continue;
}
if (strcmp(arg, "--text") == 0) {
as_text = 1;
continue;
@ -67,10 +73,12 @@ int main(int argc, char **argv)
rewind(fp);
if (e_ident[EI_CLASS] == ELFCLASS64)
process_64(fp, use_real_mode, as_text,
show_absolute_syms, show_absolute_relocs);
show_absolute_syms, show_absolute_relocs,
show_reloc_info);
else
process_32(fp, use_real_mode, as_text,
show_absolute_syms, show_absolute_relocs);
show_absolute_syms, show_absolute_relocs,
show_reloc_info);
fclose(fp);
return 0;
}